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Leased Property - Narrative (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2022 building	Dec. 31, 2024	Dec. 31, 2023 USD ($)
Lessor, Lease, Description [Line Items]
Number of buildings sold | building	2
Sale leaseback transaction, lease terms	one year
Operating lease expense | $			$ 655
Minimum
Lessor, Lease, Description [Line Items]
Operating lease term		1 year
Lease term of contract		1 year
Maximum
Lessor, Lease, Description [Line Items]
Operating lease term		10 years
Lease term of contract		14 years

X

- Definition

Lessee, Lease, Term Of Contract

+ References

No definition available.

+ Details

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X

- Definition

Number of Buildings Sold

+ References

No definition available.

+ Details

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Namespace Prefix:	bhrb_
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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479773/842-30-50-3

+ Details

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X

- Definition

Term of lessor's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 842
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479773/842-30-50-3

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X

- Definition

A description of the terms of the lease(s) related to the assets being leased-back in connection with the transaction involving the sale of property to another party and the lease of the property back to the seller.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 840
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481295/840-40-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-SubTopic 40
-Topic 842
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479741/842-40-50-2

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- Definition

The amount of the current period expense recorded for use of the property in connection with the transaction involving the sale of property to another party and the lease of the property back to the seller.

+ References

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-Topic 840
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481501/840-20-50-1

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